std::chrono::clock_cast
From cppreference.com
Defined in header <chrono>
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template< class Dest, class Source, class Duration > auto clock_cast( const std::chrono::time_point<Source, Duration>& t ); |
(since C++20) | |
Converts the time point t
of a clock Source
to an equivalent time point of the clock Dest
, using std::chrono::system_clock and/or std::chrono::utc_clock as intermediaries if necessary.
- If the expression std::chrono::clock_time_conversion<Dest, Source>{}(t) is well-formed, returns the result of that expression.
- Otherwise, if at least one of the following two expressions are well-formed, then
- If both expressions are well-formed, the conversion is ambiguous, and the program is ill-formed.
- Otherwise, exactly one of the two expressions is well-formed; the result of that expression is returned.
1) std::chrono::clock_time_conversion<Dest, std::chrono::system_clock>{}(
std::chrono::clock_time_conversion<std::chrono::system_clock, Source>{}(t))
std::chrono::clock_time_conversion<std::chrono::system_clock, Source>{}(t))
2) std::chrono::clock_time_conversion<Dest, std::chrono::utc_clock>{}(
std::chrono::clock_time_conversion<std::chrono::utc_clock, Source>{}(t))
std::chrono::clock_time_conversion<std::chrono::utc_clock, Source>{}(t))
- Otherwise, if at least one of the following two expressions are well-formed, then
- If both expressions are well-formed, the conversion is ambiguous, and the program is ill-formed.
- Otherwise, exactly one of the two expressions is well-formed; the result of that expression is returned.
1) std::chrono::clock_time_conversion<Dest, std::chrono::utc_clock>{}(
std::chrono::clock_time_conversion<std::chrono::utc_clock, std::chrono::system_clock>{}(
2) std::chrono::clock_time_conversion<Dest, std::chrono::system_clock>{}(
std::chrono::clock_time_conversion<std::chrono::system_clock, std::chrono::utc_clock>{}(
- Otherwise, this function does not participate in overload resolution.
[edit] Return value
The result of the conversion, determined as described above.
[edit] Example
This section is incomplete Reason: no example |
[edit] See also
(C++20) |
traits class defining how to convert time points of one clock to another (class template) |